New to quads bought used Sportsman 300 need help - Polaris ATV Forum
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post #1 of 13 (permalink) Old 03-22-2011, 08:51 PM Thread Starter
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New to quads bought used Sportsman 300 need help

Hello i bought a used 2008 Sportsman 300 with 4.5 hours. The man that owned it never really used it. My question is should i change the engine oil and filter or is it still fine? What about other oils? Im new so im not sure what i should do before i start riding it. I will be riding weekly and live in the desert if that matters. Also im pretty sure he put an aftermarket air filter on it, its blue and cone shaped. Is this safe for desert trails? Thanks in advance!
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post #2 of 13 (permalink) Old 03-22-2011, 09:32 PM
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i would definitely change oil, had a car that i changed the oil on before it went to storage for 2 or 3 yrs, got it out and after about 500 miles lifters started makin a lot of noise cuz the oil broke down over time, as far as filters go, it sounds similar to a kn, i would personally go with a foam filter in the desert, saw too many burnt up motors with kn's when i was down there, wix makes a foam filter for them, u can get them at any oreilly's
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post #3 of 13 (permalink) Old 03-23-2011, 06:44 AM
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Just to add to what kcaves said, I agree with him on changing the engine oil and filter. And, he's right about a foam filter for desert dust. My feeling is that unless there's evidence of leakage, the other fluids should be okay. I would also definitely grease all the fittings on the chassis. Hopefully you have the owners manual that shows where they are.

Forgot to say, the 300 is air cooled and there is an auxiliary oil cooler kit that is made for it. Might be good to have in the desert. I bought one off eBay and here's a link to one on there now: http://cgi.ebay.com/ebaymotors/Polar...item2eb2589e75

(NOTE: Regardless of what the ad or Polaris says, this cooler does NOT fit the 400HO. The 300 and 400HO engines are entirely different. I don't know why Polaris insists this will fit, but it doesn't.)

MarkC - Spokane, WA USA
"Long live the orphaned Hawkeyes and mid-size Sportsmans"

Last edited by 1of7627; 03-23-2011 at 08:46 AM. Reason: correct spelling.
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post #4 of 13 (permalink) Old 03-23-2011, 03:51 PM
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post #5 of 13 (permalink) Old 03-23-2011, 08:44 PM
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Can you post some pics of the aux oil cooler on your Hawkeye? I'd be interested on how it mounts and how the hoses run. Might look at getting a couple for my Hawkeyes as insurance .....
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post #6 of 13 (permalink) Old 03-24-2011, 06:44 AM
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These are nice kits from Polaris, but I'd ordered it for my 400HO and it doesn't fit even though that model is mentioned in the Polaris info. I've promised the kit to a relative with a Hawkeye, but I can scan the instructions for you if you want.

The instructions are specific to the Hawkeye and 300 engine. On the right side of the 300 engine (recoil starter side), under the boss where the oil filter mounts, there are two plugs in the case. These are where the high pressure hose connections are made. The oil cooler itself mounts on the frame in front of the engine. Overall, it's a pretty tidy looking installation and I'd recommend it for the air cooled 300.

The reason it won't fit on the 400HO is that the two engines are entirely different. The 400HO is liquid cooled and has a dry sump oil system with an external oil tank. The 300 is air cooled and has a wet sump. The 400HO has no high pressure connection plugs on the case for the hoses. And, the intended location for the oil cooler itself is already occupied by the radiator for the cooling system. As I said, there's no mention of the 400HO in the instructions and looking at the two engines the differences are obvious. So, I don't know what Polaris was thinking when they said this kit would fit both models except that they're built on the same chassis and someone in marketing must have thought it should.

Edit: If you want the instructions, PM me and I'll get them to you.

MarkC - Spokane, WA USA
"Long live the orphaned Hawkeyes and mid-size Sportsmans"

Last edited by 1of7627; 03-24-2011 at 09:05 AM. Reason: Note on instructions.
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post #7 of 13 (permalink) Old 03-24-2011, 01:06 PM Thread Starter
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Thanks everyone you guys rock, i will be changing the oil asap. I didnt get an owners manual! The air filter is coned and blue but does have a spongy thing around it. I'll post a pic so you guys can tell me if its safe, I,ve been snooping around the site and haven't seen much on the Sportsman 300, so sorry if i ask to much. I was wondering on a Sportsman 300 would i be able to change the rims and put bigger tires? I heard some stuff about wheel spacers, whats that about? Is there any parts out there to... how could i put it.. go faster lol!
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post #8 of 13 (permalink) Old 03-24-2011, 01:15 PM Thread Starter
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Quote:
Originally Posted by 1of7627 View Post
Just to add to what kcaves said, I agree with him on changing the engine oil and filter. And, he's right about a foam filter for desert dust. My feeling is that unless there's evidence of leakage, the other fluids should be okay. I would also definitely grease all the fittings on the chassis. Hopefully you have the owners manual that shows where they are.

Forgot to say, the 300 is air cooled and there is an auxiliary oil cooler kit that is made for it. Might be good to have in the desert. I bought one off eBay and here's a link to one on there now: Polaris ATV '06-10 Sportsman/Hawkeye Oil Cooler Kit NEW - eBay (item 200560647797 end time Apr-01-11 11:28:42 PDT)

(NOTE: Regardless of what the ad or Polaris says, this cooler does NOT fit the 400HO. The 300 and 400HO engines are entirely different. I don't know why Polaris insists this will fit, but it doesn't.)
Whats the oil cooler for? Is it to cool the engine?
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post #9 of 13 (permalink) Old 03-24-2011, 01:26 PM
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Yes, the oil cooler helps keep the engine cooler as oil is a major player in air cooled engines. The 300 also has a fan that comes on and assists when the engine gets too hot.

I scanned the page from my service manual that has the grease fittings. You should hit them too.


MarkC - Spokane, WA USA
"Long live the orphaned Hawkeyes and mid-size Sportsmans"
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post #10 of 13 (permalink) Old 03-24-2011, 01:58 PM Thread Starter
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Thank you, that real nice of you. I'll be checking that out later today!
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